161616661615156 has 48 divisors (see below), whose sum is σ = 321981012154368. Its totient is φ = 70262593887200.

The previous prime is 161616661615141. The next prime is 161616661615159. The reversal of 161616661615156 is 651516166616161.

It is a super-2 number, since 2×161616661615156² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161616661615156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161616661615159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6629721 + ... + 19162111.

It is an arithmetic number, because the mean of its divisors is an integer number (6707937753216).

Almost surely, 2^{161616661615156} is an apocalyptic number.

It is an amenable number.

161616661615156 is a deficient number, since it is larger than the sum of its proper divisors (160364350539212).

161616661615156 is a wasteful number, since it uses less digits than its factorization.

161616661615156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12545172 (or 12545170 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 58.

The spelling of 161616661615156 in words is "one hundred sixty-one trillion, six hundred sixteen billion, six hundred sixty-one million, six hundred fifteen thousand, one hundred fifty-six".